Evaporation of multicomponent liquid fuel droplets

Abstract

SUMMARYA theoretical investigation on evaporation of a two-component liquid fuel droplet in high-temperature quiescent gaseous surroundings has been made from the numerical solution of conservation equations of heat, mass and momentum transports in the carrier and droplet phases. Liquid fuel droplets containing (i) components of widely varying volatilities, namely, n-hexane and n-hexadecane and (ii) components of closely spaced volatilities, namely, n-hexane and benzene, have been considered for the studies. The evaporation characteristics, namely mass depletion, droplet temperature and droplet composition histories with time, have been evaluated in terms of the pertinent input parameters, namely the initial composition of the drop constituents and the free stream temperature. The present studies have been made on the basis of both (i) the interdiffusion (finite diffusion in the droplet phase) model, and (ii) the rapid mixing (infinite diffusion in the droplet phase) model. The results from both the models have been compared to ascertain the accuracy of the rapid mixing model.

Oxy-fuel combustion technology: current status, applications, and trends

“…Negeed et al reported that the maximum diameter droplet spread increases with the increase of Weber number, size, or impinging velocity of the droplet. Bhattacharya et al compared the inter‐diffusion model and rapid mixing model in predicting the droplets vaporization of two‐component fuel. They reported that the inter‐diffusion model is more successful in predicting the experimental data, as it assumes that more volatile component of the fuel firstly vaporizes out of the droplet surface while the internal composition remains same.…”

“…Negeed et al [107] reported that the maximum diameter droplet spread increases with the increase of Weber number, size, or impinging velocity of the droplet. Bhattacharya et al [108] compared the inter-diffusion model and rapid mixing model in predicting the droplets vaporization of two- consequently increased the reaction kinetics and significantly reduced the formation of NO x and CO. They reported an increase of 1.9 orders of magnitude in the radiation from the flame in the swirl air combustor compared with that in the experimentally tested one.…”

Study of Combustion Characteristics of Ethanol at Different Dilution With the Carrier Gas

“…The spray outer zone was found to ex hibit larger diameter than those in the inner zone which can be attributed to the effect of spray-induced ambient air flow. Bhattacharya et al [8] used numerical model to investigate the evaporation of two component fuel droplets. Similar trend has also been observed by Ghassemi et al [6] in his experiment on evaporation of kerosene droplets.…”

A study of thin‐flame quasisteady sphericosymmetric combustion of multicomponent fuel droplets. Part I: modelling for droplet surface regression and non‐unity gas‐phase Lewis number

“…Figure 11 reveals that for the major portion of the droplet life, the droplet temperature remains nearly uniform. Hence, the use of in"nite conductivity model for the energy equation, as done by Bhattacharya et al (1996) seems justi"ed. Towards the middle of the droplet life, temperature of the entire droplet sharply increases without noticeable change in droplet size.…”